Mine is running a LRP spec 2. It's just a rebadged SH .28 6p... just like the XTM 457 and the Nosram .28 Monster. The truck is down for a rebuild at the moment, so a video isn't possible. There are tons of videos out there of Savages with these engines though, and mine is nothing special in that regard, so a search should provide plenty of results similar to mine.

I'm not saying the OS is a bad engine, just that there are cheaper and stronger alternatives available. If you feel better running the OS engine then by all means do it. Geared and setup right, it will still be a very fast truck.
But like RCSavager said, the Axial .32 is the way to go... or at least it's the way to go if you want to run one of the .30+ engines.